Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: Code words in text are shown as follows: "JShell allows us to call the System.out.printf method to easily format output we want to print."

A block of code is set as follows:

double getGeneratedRectangleHeight() {
    final Rectangle rectangle = new Rectangle(37, 87);
    return rectangle.height; 
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

double getGeneratedRectangleHeight() {
    final Rectangle rectangle = new Rectangle(37, 87);
    return rectangle.height; 
}

Any command-line input or output is written as follows:

javac -version

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Click on Accept and then click on Exit."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.